Pushing the Range Limits of Commercial Passive RFIDs
Pushing the Range Limits of Commercial Passive RFIDs
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发表时间：
2019
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通讯作者：
Jingxian Wang;Junbo Zhang;R. Saha;Haojian Jin;Swarun Kumar
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作者：
Jingxian Wang;Junbo Zhang;R. Saha;Haojian Jin;Swarun Kumar
这篇论文问：“我们能推动商业无源RFID的普遍范围限制吗？”。今天的商业无源RFID报告的范围最多为5-15米。这限制了RFID只能在仓库，商店和工厂的特定检查站被检测到，使它们处于这些空间之外的通信范围之外。提高RFID范围的最先进方法开发了新的标签硬件，这必然牺牲了无源RFID的一些最有吸引力的特性，例如低成本，小尺寸或没有电池。我们提出了PushID，一个系统，利用读者之间的合作，以提高商业无源RFID标签的范围，而不改变标签。PushID使用分布式MIMO在标签处跨地理上分离的RFID读取器相干地组合联合收割机信号。在这样做时，它解决了先有鸡还是先有蛋的问题，即在没有来自标签本身的任何反馈的情况下，推断最佳波束成形参数以将能量射到标签，标签本身首先需要该能量来响应。对具有8个分布式RFID阅读器的PushID的原型评估显示，与最先进的商业阅读器和其他两种方案相比，距离最近的阅读器的范围为64米，范围提高了7.4倍，1.2倍和1.6倍[10，33]。
This paper asks: “Can we push the prevailing range limits of commercial passive RFIDs?”. Today’s commercial passive RFIDs report ranges of 5-15 meters at best. This constrains RFIDs to be detected only at specific checkpoints in warehouses, stores and factories today, leaving them outside of communication range beyond these spaces. State-of-the-art approaches to improve the range of RFIDs develop new tag hardware that necessarily sacrifices some of the most attractive features of passive RFIDs such as their low cost, small form-factor or the absence of a battery. We present PushID, a system that exploits collaboration between readers to enhance the range of commercial passive RFID tags, without altering the tags whatsoever. PushID uses distributed MIMO to coherently combine signals across geographically separated RFID readers at the tags. In doing so, it resolves the chicken-or-egg problem of inferring the optimal beamforming parameters to beam energy to a tag without any feedback from the tag itself, which needs this energy to respond in the first place. A prototype evaluation of PushID with 8 distributed RFID readers reveals a range of 64-meters to the closest reader and a 7.4×, 1.2× and 1.6× improvement in range compared to state-of-the-art commercial readers and other two schemes [10, 33].